Wall Co. leased office premises to Fox, Inc., for a 5-year term beginning January 2, Year 4. Under the terms of the operating lease, rent for the first year is $8,000 and rent for years 2 through 5 is $12,500 per annum. However, as an inducement to enter the lease, Wall granted Fox the first 6 months of the lease rent-free. In its December 31, Year 4, income statement, what amount should Wall report as rental income?